Grading program HELP!

I'm working on a grading program that will require the use of a couple classes. The program contains a list of "program assignments" which there are 5, and 3 test scores. I'm stuck writing the average methods Along with the total exam scores/program scores. Any help will be appreciated! Here's the classes I'm using... Thanks in advance!!

The average score for exam1 is: 75.0
The average score for exam2 is: 80.0
The average score for exam3 is: 85.0

The average score for program 1 is: 10.0
The average score for program 2 is: 15.0
The average score for program 3 is: 15.0
The average score for program 4 is: 15.0
The average score for program 5 is: 20.0